Fluid pressure connection



Patented Sept. 13, 1932 Umran era-res Parana twee CHARLES EDGAR MAYNARD, OF

NORTHAMPTON, MASSACHUSETTS, ASSIGNOR TO THE FISK RUBBER COMPANY, OF CHIGOIPEE FALLS, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS FLUID PRESSURE CONNECTION Application filed July 5 1928. Serial No. 290,500.

My invention relates to fluid pressure connections such as are used 1n the vulcanization of inner tubes for pneumatic tires, pneumatic tire casings, bicycle tires and the like. More particularly it relates to improvements in the connection disclosed and claimed in my copending application Serial Number 256,078, filed February 28, 1928. It has among its objects the provision of a connection which may be used with articles in which the valve stem is provided with a valve orfrom which the valve parts have been removed. A further object is to provide a connection which is easily kept clean. A. further object is to provide a connection which, in case of leakage of the fluid pressure, will prevent contact of the escaping fluid with the mold and article. Other and further objects will be apparent from the following specification and claims: 7

In the accompanying drawing which illustrates one embodiment of my invention,

Figure 1 is a view, partly in section, showing the connection in operative relation with the valve stem of an inner tube positioned in a mold;

Figure 2 is a section on an enlarged scale talfien substantially on line 22 of Figure 1; an

Figure 3 is a plan view of the connection.

Referring to the drawing, 10 designates a cylindrical casing which is adapted to be held in adjusted fixed position with respect to the mold 11, and the valve stem 12 of an article 13 contained therein, by means of a bracket 14 and set screw 15, the bracket 14 being secured to the mold support by bolts 16. Positioned within the casing 10, as best shown in enlarged Figure 2, is a'plunger 17 normally pressed outwardly of the casing by means of a spring 18 held between a collar 19, secured on the plunger and plug 20, threaded in the bore of casing 10, through which the plunger extends. Plunger 17 is centrally bored as at 21 to provide a passage inclined outwardly as shown at 9.

at 25. to engage within the for fluid pressure supplied from any; suitable source, not shown, through piping 22.

Casing 10, adjacent the free end of plunger 17, is preferably flared outwardly as shown at 23 to assist in guiding the valve stem into engagement with plunger 17 as later more fully described. The flared end of casing 10 is provided with one or more openings which in the embodiment shown take the former radial slots 24 which extend below the point of engagement of the plunger 17 and the valve stem ofthe article to be inflated. The base of slots 24 are preferably The free end otplunger 17 is tapered as open end of valve stem 12. Adjacent the end of the plunger 17 and secured transversely of the bore 21 I provide a pin 26, preferably flattened on its outer surt'ace and positioned to engage the spindle 27 of valve mechanism 28 of the valve stem to retract and open the valve as spindle 17 engages within the valve stem 12 and to hold the valve open. I -The connection is shown in Figure 2 inoperative position with respect to valve stem 12 and as fully set out in my above mentioned copending application the valve stem 12 is held influid tightrelation with plunger 17 solely by the fluid pressure built. up within the article 13 acting against the base 01"- the valve stem. Slots 24 give access to the tapered sides of plunger'17 for the removaloi any foreign matter which may collect be tween that portion of the plunger and casing 10 and prevent any fluid which may escape from impinging-on the mold or article. The inclined surfaces 9 which slope in the general direction of the taper of plunger 17 further assure the conductingof any escaping-fluid a casing adapted-to bemounted'in predetermined relation with respect to the valve stem of an article to be inflated, a spring pressed bored plunger positioned within the casing and adapted to be held in fluid tight engagement with the valve stem by the pressure in the article, said casing being formed to guide the valve stem into engagement with the plunger, openings through the walls of said casing to conduct escaping fluid away from the article and means carried by the plunger to hold the valve in the valve stem open while the plunger is in engagement with the valve stem.

2. A fluid pressure connection comprising a casing adapted to be held in adjustable predetermined telescoping relation with the end of the valve stem of an article to be inflated,

. a portion of the casing surrounding the valve stem being flared outwardly and provided with a plurality of slots forming openings to the interior of the casing, a bored plunger positioned within the casing and having its end adjacent the slots tapered to seat inside the valve stem, the base of said slots being inclined in the general direction of the taper of the plunger, a pin secured transversely of the bore of the plunger and positioned to engage the valve spindle of the valve mechanism located within the valve stem when the tapered end of the plunger is introducedinto the valve stem, and a spring tending to force the tapered portion of the plunger into sealin en a ement with the valve stem a ainst the pressure within thearticle acting against the valve stem.

3. A fluid pressure connect1on comprising a casing adapted to be mounted in predetermined relation with respect to the valve stem of an article to be inflated, a spring pressed bored plunger positioned Within the casing and adapted to be held in fluid tight engagement with the valve stem by the pressure in the article, said casing being formed to guide the valve stem into engagement with the plunger and openings through the walls 'of the casing to conduct escaping fluid away from the article.

4. A fluid pressure connection comprising -a casing adapted to be held in predetermined relation with respect to the valve stem of an article to be inflated, one end of the casing being flared outwardly and provided with at least one radial opening to the interior of the casing, a bored plunger positioned within the casing and having its end adjacent the flared end of the casing formed to make a fluid tight engagement with the valve stem, and means to force the plunger into engagement with the valve stem against the fluid pressure within the article acting against the valve stem. 7

5. A fluid pressure connection comprising a casing adapted to be held in predetermined telescoping relation with respectto the valve stem of an article tovbe inflated,"0ne end of the casing being flared outwardly and provided with a plurality of radial openings to the interior of the casing, the base of the openings being flared outwardly and away from the adjacent end of the casing, a bored plunger positioned within the casing and having its end adjacent the flared end of the casing tapered to make a fluid tight engagement with the valve stem, and means to force the plunger into engagement with the valve stem against the fluid pressure within the article acting against the valve stem.

CHARLES EDGAR MAYNARD. 

